C#

public Form1()
        {
            InitializeComponent();

            buttonTimer = new Timer();
            buttonTimer.Tick += new EventHandler(button_Tick);
            buttonTimer.Interval = (50);
            
            populate.BackColor = Color.Black;
            populate.ForeColor = Color.Orange;

            buttonTimer.Start();
        }

        void button_Tick(object sender, EventArgs e)
        {
            if (populate.BackColor == Color.Orange)
            {
                populate.BackColor = Color.Black;
                populate.ForeColor = Color.Orange;
            }

            if (populate.BackColor == Color.Black)
            {
                populate.BackColor = Color.Orange;
                populate.ForeColor = Color.Black;
            }
        }
}